linux-kernel - Re: [RFC PATCH 07/14] Add sample notification program [ver #3]

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Message-ID: <20200126154730.GA18893@roeck-us.net>
Date:   Sun, 26 Jan 2020 07:47:30 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     David Howells <dhowells@...hat.com>
Cc:     torvalds@...ux-foundation.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Stephen Smalley <sds@...ho.nsa.gov>, nicolas.dichtel@...nd.com,
        raven@...maw.net, Christian Brauner <christian@...uner.io>,
        keyrings@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-block@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 07/14] Add sample notification program [ver #3]

On Wed, Jan 15, 2020 at 01:31:38PM +0000, David Howells wrote:
> The sample program is run like:
> 
> 	./samples/watch_queue/watch_test
> 
> and watches "/" for mount changes and the current session keyring for key
> changes:
> 
> 	# keyctl add user a a @s
> 	1035096409
> 	# keyctl unlink 1035096409 @s
> 
> producing:
> 
> 	# ./watch_test
> 	read() = 16
> 	NOTIFY[000]: ty=000001 sy=02 i=00000110
> 	KEY 2ffc2e5d change=2[linked] aux=1035096409
> 	read() = 16
> 	NOTIFY[000]: ty=000001 sy=02 i=00000110
> 	KEY 2ffc2e5d change=3[unlinked] aux=1035096409
> 
> Other events may be produced, such as with a failing disk:
> 
> 	read() = 22
> 	NOTIFY[000]: ty=000003 sy=02 i=00000416
> 	USB 3-7.7 dev-reset e=0 r=0
> 	read() = 24
> 	NOTIFY[000]: ty=000002 sy=06 i=00000418
> 	BLOCK 00800050 e=6[critical medium] s=64000ef8
> 
> This corresponds to:
> 
> 	blk_update_request: critical medium error, dev sdf, sector 1677725432 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
> 
> in dmesg.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>

mips:allmodconfig:

samples/watch_queue/watch_test.c: In function ‘keyctl_watch_key’:
samples/watch_queue/watch_test.c:34:17: error: ‘__NR_keyctl’ undeclared

Guenter